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流程工业经济规划软件 PIMS
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计划优化系统 PIMS 简要介绍

 

  PIMS是一个功能强大且易于使用的流程工业经济计划的线性规划模型系统。系统设计在个人电脑上运行。它用来为石油化工以及其它流程工业的运行和设计进行优化。它可用于短期计划或长期战略规划中。它的有效使用并不要求用户是计算机专家或线性规划专家。系统包括指导性的用户文档和一个完整的实例。允许用户为他们工厂产生动态的过程流程图。模型数据的输入和维护集成了Lotus1-2-3 Microsoft Excel 和其它工作表软件融会沟通的环境。扩展的综合诊断信息告诉用户模型中什么地方可能或已存在错误。运行结果以报表的形式提供一个可供工程师阅读的文档。也就是说,用户花很少的时间就能完成大量的工作。主要是作出快速准确的经济决策—特别是全面复杂的优化。

  在石油化工中,应用PIMS主要可以解决一下几个方面的问题。

  瓶预问题研究 。利用 PIMS 系统可以快速地分析判断加工不同原油的装置加工瓶颈,并从经济上给出解决装置瓶颈的最佳方案。同时,在装置存在瓶颈的情况下给出最优的生产方案。

 1) 原油选择。市场上的原油有很多种,如何选择适合我们系统加工设备加工而且效益又佳的原油进行加工是一项复杂而重要的工作。同时还可以利用该系统进行保本点的优化求解。

 2) 方案优化。炼油企业在市场经济条件下已经不再是原来计划体制时期的运作—上面安排什么企业就生产什么,或安排多少就生产多少—企业必须根据市场的需求来安排生产什么,而且什么效益好就生产什么。在这种情况下,生产方案的优化十分重要,我们利用PIMS解决了许多这方面的问题,为企业快速反应发挥了重要作用。

 3) 生产经营计划编制。企业的生产经营计划是全企业生产活动的依据,对企业的效益起着十分重要的作用,国外大的石油公司称之为“导航”。利用PIMS系统编制不同周期的生产经营计划。从使用情况看,只要建立的模型能够反映企业实际生产经营状况,就可利用PIMS编制又快、准确,最经济的计划。

  在石油化工中,应用PIMS主要可以解决以下几个方面问题。

原油(原料)选择优化

  原油成本通常占一个炼厂的70%左右的生产成本。市场上的原油有很多种,如何选择适合加工设备且经济效益最佳的原油是一项异常复杂且重要的工作。 PIMS能够在满足生产约束的条件下,以生产经济效益最大化选择加工原油的种类,比例等。可用于原油采购计划,原油加工计划,原油混合计划的制定。

装置加工方案优化

  企业必须根据市场需求以及经济小效益安排生产什么,如何生产,如何根据原油性质优化生产流程。

  PIMS能够在满足生产装置约束的前提下,结合原油性质以及原油配比,优化上下游装置物料流向,生产方案选择等。可用于制定装置生产计划或排产计划。

产品调和方案优化

  汽、柴、煤等产品调和,既影响产品质量又影响整个工厂生产的经济效益。是整个炼厂生产重要的一环。

  PIMS采用了内置的非线性调和模型或应用自定义调和模型,以装置生产能力、产品质量指标等为约束条件,以经济效益最大化为目标,优化调和配方以及组分最佳使用,实现质量卡边,减少质量偏差和重新调合,最终实现调和经济效益最大化。

瓶预问题研究

  应用PIMS能够针对所加工的原油,装置加工流程、负荷,产品调和等,能快速找出影响经济效益进一步提高的瓶颈,并从经济上给出解决装置瓶颈的最佳方案。充分挖掘各个环节的潜力,时可实现炼厂生产经济效益最大。

罐存计划优化

  为避免出现溢流或者断供,装置往往运行于一个保守的负荷并保持罐的存量在一个保守的范围。操作人员常常根据经验判断生产负荷稍高或稍低一点将会发生什么。这一方面造成库存占压成本较高,另一方面库存的能力没有充分发挥。

  应用PIMS能够准确预测生产装置对储罐的影响,充分发挥储罐的能力,减少保守操作,减少库存占压成本,实现最安全最经济的罐存计划。

 

Aspen PIMS

     Aspen PIMS (Process Industry Modeling System) – the foundation of AspenTech's powerful, easy-to-use family of petroleum downstream value chain solutions – is a decision support solution that enables refiners and petrochemical producers to achieve dramatic productivity increases while improving overall supply chain agility and profitability。 The industry standard for petroleum industry planning, Aspen PIMS is used by more than 75% of the refineries, and more than 60% of all petrochemical plants, in the world。

(一)The Challenge

     Refiners and petrochemical producers face a climate of industry consolidation, increased competition, growing safety and environmental mandates, and a booming internet culture. Their fundamental challenge is to respond to these variables while still developing the most profitable operating plans, meeting regulatory demands, and making key decisions about capital expenditures
for both compliance and profit improvements. To do so, they must also consider the following:

  • Alternative feedstocks and prices
  • Alternative products and prices
  • Product blending specifications
  • Process plant configurations
  • Capital improvements
  • Purchases, sales, and trades
  • Inventories, imports, and exports

(二)The Solution:Aspen PIMS

     Aspen PIMS allows refining and petrochemical companies to develop optimal planning models that balance the complexities
of today's environment with maximum fidelity. It provides these benefits:

  • Increased profits through model accuracy and flexibility. Aspen PIMS enables true modeling of key planning work processes, including model analysis, crude and feedstock selection, production planning, operations planning, and blending. Aspen PIMS models include feedstock and intermediate options with price tiers, crude fractionation, and property representation.

  • Reduced operating costs through a streamlined planning process that enables improved asset utilization, utility right-sizing, utilities reduction, and loss reduction
  • Sustained value through common process models, consistent model validation and calibration methods, and custom reporting.

     Aspen PIMS optimizes the operation and design of refineries, petrochemical plants, and other industry facilities; and can
be used for a wide variety of short-term and strategic planning purposes, such as:

  • Evaluation of alternative feedstocks
  • Optimization of product slates
  • Evaluation of grassroot opportunities and/or expansions

(三)Features

  • Linear and non-linear modeling capabilities. Successive linear programming (SLP) is the primary non-linear feature.
    Aspen PIMS also offers generalized non-linear recursion, interaction blending, additive blending, and mixed integer modeling, including special ordered sets capability.

  • Integration with spreadsheet workbooks. Input and maintenance of model data is easy and efficient through the spreadsheet interface.
  • Integration with databases. Aspen PIMS integrates easily with Microsoft Access, SQL-Server, and Oracle.
  • Sophisticated Microsoft Windows graphical user interface. Model management, data management, matrix generation, solution, and reporting are all accessible through the user interface.

(四)The Aspen PIMS Solution

     The base Aspen PIMS system, which solves up to 1000 model constraints, is enhanced by Turbo PIMS, which enables
the user to build larger, more complex models (up to 16,000 rows). The combination of the Aspen PIMS system and Turbo PIMS is the foundation for several other PIMS applications, including the following:

  • PIMS-EE:Aspen PIMS models have traditionally been contained in spreadsheets and stored locally on the user's computer, making it difficult to share, maintain, and control versions of the model. PIMS Enterprise Edition (PIMS EE) stores models in a central relational database, and offers role-based security and multi-user access. Users can share the same model without having to copy files between computers, and can access individual model tables. Furthermore, storing models in a relational database facilitates integration with other enterprise systems and ensures a high degree of data integrity not available with spreadsheets.
  • MPIMS: MPIMS allows users to link together a number of single-plant Aspen PIMS models in order to form a complex
    multi-source, multi-plant, multi-market supply/demand/ distribution network. An MPIMS model can be comprised of up to 100 single-plant Aspen PIMS local models, together with one additional global model, which defines the supply/demand/distribution implications.
  • PPIMS: PPIMS allows users to solve complex multi-period problems, such as modeling inventories. PPIMS models can consist of multiple time periods of user-defined length, and can include all of the powerful distributive recursion capabilities across the time periods. The implications of inventory qualities that vary with time are also accurately simulated for their true economic implications.

  • PIMSPlus: PIMSPlus is a set of mathematical productivity tools that significantly increase the already-powerful Aspen
    PIMS system. Included in PIMSPlus are:
    1. PIMS-SI, which provides the interface between Aspen PIMS to rigorous non-linear process simulators such as the Aspen Cat Cracker Model for refineries and the Spyro yield simulator for olefins plants
    2. PIMS-MIP, which models activities requiring integer values; and optimizes mutually-exclusive processes, threshold purchases, and throughputs
    3. PIMS-SC, which performs matrix calculations on one or more submodels without running PIMS; and provides fast and efficient submodel validation and post-optimal data analysis
    4. PIMS-XNLP, a proprietary non-linear optimization solution algorithm which requires no changes to the PIMS model; and optimizes weight-based quality recursion pooling in volume-based model automatically
    5. PIMS-ABML, a portfolio of linear and non-linear blending prediction methods and correlations that provide blend technology and modeling consistency.

(五)Other Aspen PIMS Products

  • PIMSXCHG, a powerful tool that adds sophisticated integration capabilities between Aspen PIMS programs and any ODBCcompliant databases, online data systems (such as Aspen InfoPlus.21), and oil movement and blend control systems
  • LPIMS, a multi-language product which allows PIMS users to set GUI options and solution reports in a language of his/her choice
  • Aspen Report Writer, a report writer which consolidates data from different sources into easy-to-read, customizable reports without Aspen PIMS programming
  • Planning Model Accuracy (PMA), which enables dynamic backcasting and updating of PIMS models. Included in this
    application are Aspen Performance Scorecard, Planning vs Actual (PVA) and the Aspen PIMS submodel calculator. For highly non-linear processes, it can sometimes be beneficial to use rigorous non-linear simulation directly within the Aspen PIMS optimization process. PIMS-SI (Simulator Interface) allows users to interface the Aspen PIMS model to an external simulator for this purpose.

 


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